Calculations at a regular hendecagon, a polygon with 11 vertices. Enter one value and choose the number of decimal places. Then click Calculate.
di = a * sin( π * i/11 ) / sin( π/11 )
h = a / ( 2 * tan( π/2/11 ) )
p = 11 * a
A = 11 * a² / ( 4 * tan(π/11) )
rc = a / ( 2 * sin(π/11) )
ri = a / ( 2 * tan(π/11) )
Angle: 9/11*180° ≈ 147.27°
π = 180° = 3.141592653589793...
Edge length, diagonals, height, perimeter and radius have the same unit (e.g. meter), the area has this unit squared (e.g. square meter).
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